Fuser Frame Resin Metal Composite Rigidity
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Solution Overview
Problem
Existing fusers in image forming apparatuses face challenges in maintaining structural integrity and complexity due to the use of resin frames, which can deform and have dimensional errors, while metal frames offer rigidity but are difficult to shape and connect effectively with resin components.
Innovation Solution
A fuser design incorporating a resin frame for side support and a metal center frame with reinforcing portions and a connecting member made of metal, allowing for complex shapes and improved structural stability by connecting resin frames with metal components, thereby enhancing rigidity and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a resin frame is used to support the roller, then it is easier to prepare complex shapes for supporting the roller, but the frame may deform and have dimensional errors
Solution Approach 1:
The frame is constructed as a composite structure combining resin and metal materials. The resin portion provides complex shaping capability while the metal reinforcing portion ensures dimensional accuracy and prevents deformation. This composite approach allows the frame to simultaneously achieve ease of manufacture for complex geometries and high manufacturing precision.
2Strength
If a metal frame is used, then rigidity and structural integrity are improved, but it is difficult to shape and connect effectively with resin components
Solution Approach 1:
The frame is divided into distinct resin portions and metal reinforcing portions, each serving specific functions. The resin portions are optimized for complex shaping and connection with other resin components, while the metal reinforcing portions provide structural integrity and rigidity. This segmentation allows each material to be manufactured and connected using its most suitable processes.
3Device complexity
If the frame structure is simplified to reduce complexity, then manufacturing becomes easier, but structural integrity and stability are compromised
Solution Approach 1:
The frame employs local quality by concentrating metal reinforcing portions only in specific areas where structural stability is critical, such as the connection points between the side frames and the rotating body. The resin portions are used in areas where complex shaping is needed but structural loads are lower. This localized application of different materials optimizes both structural stability and ease of manufacture.
Data Source
AI summary
A fuser includes: a rotating body; a roller configured to convey a sheet in a conveyance direction; a pair of bearings supporting the roller; one side frame made of a resin, supporting one of the pair of bearings; another side frame supporting the other of the pair of bearings, and arranged at a distance from the one side frame in the axial direction; and a center frame made of a metal, including a main-body portion arranged on an opposite side of the rotating body with respect to the roller. One end portion in the axial direction of the main-body portion includes a first fixing portion which is fixed to the one side frame, and a second fixing portion which is arranged on an upstream side of the first fixing portion in the conveyance direction, and is fixed to the one side frame.